I think Warriors will be very motivated to defend their championship and win 3 in a row. We all know how hard it is to three-peat, last team to do it was the Lakers in early 2000s', that is almost 20 years ago; Heat had a decent chance in 14' but
the best player in the world had to deal with leg cramps.
Another reason would be expiring contracts of Klay and Durant, this could be the last season they play together, so why not win again.
Don't forget that Warriors are moving to their new arena next season 2019-20, what better way to celebrate than winning 3rd in a row. If they stay healthy throughout the season and that Boogie thing work as expected, it might not translate as in 70+ regular season wins, but they could easily sweep through playoffs/finals.
They will sweep thru playoffs a lot better this season if they can just keep healthy, that is an important part. Winning three peat is a great achievement however keeping players motivated is another reason why warriors may have troubles.
We all know warriors is the best team in the league with miles difference, now that rockets lost ariza as well its gonna be harder for them and lakers is not ready yet. However the only people that can beat warriors is warriors itself, the contract discussions, the who is the fmvp discussions, the who is the leader and so forth.
Dray keeps saying he wants max and that is A LOT of money for dray for example so if he even slightly understands he won't get max do you really believe he will put in that effort? If motivated and healthy, warriors can destroy any team they face.